Velocity cylindrical components from OpenFOAM

aerospain · October 10, 2012, 10:57

Hi all!

I would like to ask for confirmation of what I'm thinking I'm getting out of an axisymmetric run with OpenFOAM.

Both from sampling during or after calculation and saving data from ParaView, I get velocity components as U:0, U:1 and U:2, and coordinates as Points:0, Points:1, Points:2.

I understand the Points coordinates are in X,Y,Z format. But, I would like to have confirmation if the velocity is in radial, axial and tangential components since I have defined two 'wedge' bc's and an 'empty' bc, which will tell OpenFOAM where are my tangential, radial and axial directions, won't they?

Thanks in advance!

LarsPT · October 16, 2012, 09:56

Hi aerospain,

in my opinion you will always get x-, y-, and z-components in OpenFOAM, although you specified wedge BCs. However, you can compute the radial, tangential, and axial components in Paraview by using the common transformation between Cartesian and cylindrical coordinates, and implement them using the calculator filter.

Best regards

aerospain · October 17, 2012, 08:09

Thanks Lars,

That sounds interesting. Could you tell me which *.C source file is the one calculating the vectorField, please? I might be able to decipher which I'm getting.

cheers!

October 10, 2012, 10:57	Velocity cylindrical components from OpenFOAM	#1
aerospain Senior Member aerospain Join Date: Sep 2009 Location: Madrid, Spain Posts: 149 Rep Power: 17	Hi all! I would like to ask for confirmation of what I'm thinking I'm getting out of an axisymmetric run with OpenFOAM. Both from sampling during or after calculation and saving data from ParaView, I get velocity components as U:0, U:1 and U:2, and coordinates as Points:0, Points:1, Points:2. I understand the Points coordinates are in X,Y,Z format. But, I would like to have confirmation if the velocity is in radial, axial and tangential components since I have defined two 'wedge' bc's and an 'empty' bc, which will tell OpenFOAM where are my tangential, radial and axial directions, won't they? Thanks in advance!

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October 16, 2012, 09:56		#2
LarsPT Member Lars Kiewidt Join Date: Sep 2009 Location: Germany Posts: 54 Rep Power: 17	Hi aerospain, in my opinion you will always get x-, y-, and z-components in OpenFOAM, although you specified wedge BCs. However, you can compute the radial, tangential, and axial components in Paraview by using the common transformation between Cartesian and cylindrical coordinates, and implement them using the calculator filter. Best regards

October 17, 2012, 08:09		#3
aerospain Senior Member aerospain Join Date: Sep 2009 Location: Madrid, Spain Posts: 149 Rep Power: 17	Thanks Lars, That sounds interesting. Could you tell me which *.C source file is the one calculating the vectorField, please? I might be able to decipher which I'm getting. cheers!